Measurement of τ Polarisation in Z/ γ∗ → ττ Decays In Proton–Proton Collisions at √s=8 TeV with the ATLAS Detector

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Measurement of τ Polarisation in Z/ γ∗ → ττ Decays In Proton–Proton Collisions at √s=8 TeV with the ATLAS Detector

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Title: Measurement of τ Polarisation in Z/ γ∗ → ττ Decays In Proton–Proton Collisions at √s=8 TeV with the ATLAS Detector
Author(s):
Aaboud, M.;
Aad, G.;
Abbott, B.;
Abdinov, O.;
Abeloos, B.;
Abidi, S. H.;
AbouZeid, O. S.;
Izen, Joseph M.;
Meirose, Bernhard;
Reeves, Kendall;
ATLAS Collaboration
Date Created: 2018-02-24
Item Type: article
Keywords: Show Keywords
Abstract: This paper presents a measurement of the polarisation of τ leptons produced in Z/ γ∗→ ττ decays which is performed with a dataset of proton—proton collisions at √s=8 TeV, corresponding to an integrated luminosity of 20.2 fb⁻¹ recorded with the ATLAS detector at the LHC in 2012. The Z/ γ∗→ ττ decays are reconstructed from a hadronically decaying τ lepton with a single charged particle in the final state, accompanied by a τ lepton that decays leptonically. The τ polarisation is inferred from the relative fraction of energy carried by charged and neutral hadrons in the hadronic τ decays. The polarisation is measured in a fiducial region that corresponds to the kinematic region accessible to this analysis. The τ polarisation extracted over the full phase space within the Z/ γ∗ mass range of 66 < m_{Z/γ∗} < 116 GeV is found to be P_τ = - 0.14 ± 0.02 (stat) ± 0.04 (syst). It is in agreement with the Standard Model prediction of P_τ = - 0.1517 ± 0.0019 , which is obtained from the ALPGEN event generator interfaced with the PYTHIA 6 parton shower modelling and the TAUOLA τ decay library.
Publisher: Springer New York LLC
ISSN: 1434-6044
Source: European Physical Journal C
Link to Related Resource: http://dx.doi.org/10.1140/epjc/s10052-018-5619-1
Persistent Link: http://hdl.handle.net/10735.1/6270
Bibliographic Citation: Aaboud, M., G. Aad, B. Abbott, O. Abdinov, et al. 2018. "Measurement of τ polarisation in Z/ γ∗→ ττ decays in proton–proton collisions at √s=8 TeV with the ATLAS detector." European Physical Journal C 78(2), doi:10.1140/epjc/s10052-018-5619-1
Terms of Use: CC BY 4.0 (Attribution)
©2018 CERN for the benefit of the ATLAS collaboration.

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CC BY 4.0 (Attribution) Except where otherwise noted, this item's license is described as CC BY 4.0 (Attribution)